Hi OperaGuy, Thanks, It is likely a Mac Carrara issue. The Demo is 5.02 btw. I also use the Transposer import. Fine with strand based hair- except with Global lighting BTW: since I've the demo-there are no instructions. So I've been happily importing and rendering anyway-but I dont see where to import image.hdr's. Irradiance Map option does not seem to SEE xxx.hdr files.